do these fit threaded curl bars?

I don't know what threaded curl bars are, but if it helps, the collar openings are 1.25" open and 1.125" closed and fit the standard bars we use for Les Mills Body Pump.

what diameter light has to do thick bar serve?

I have the Troy Lite barbell which has a 1" diameter bar and the 1" Lock-Jaw Collar works perfectly. I think, as mentioned here, Olympic bars have a thicker diameter bar.

I have 28mm (not 1 inch) smooth bars. Will these fit?

On a 1 1/16" bar they are a tight fit. Since a 28 mm bar is equivalent to about 1 7/64" I doubt that they would fit.

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Product ID: 2148232

Details

Brand
ironcompany
Finish Type
Black
Grip Size
1
Grip Type
Knurled
Item Weight
3.84 ounces
Manufacturer

🔒1" standard bar fit

⏱️fast locking & release

⚙️solid injection molded frame

3319F

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Sold byAmazon New CaledoniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔒 Lock in your gains, unlock your potential!

LIGHTWEIGHT POWER - Only 4 ounces per set, adding zero bulk but maximum security
TRUSTED SINCE 86 - Backed by a 3-year limited warranty and a legacy of fitness innovation
RAPID LOCKING ACTION - Single-action cam lock secures your weights in a snap—no fumbling, no delays
UNIVERSAL 1 INCH FIT - Seamlessly clamps all standard barbell sleeves for instant workout readiness
UNBREAKABLE DURABILITY - Injection molded nylon resin frame built to endure your toughest lifts

The ironcompany Lock-Jaw 1 Inch Barbell Collar Pair is engineered for serious lifters who demand reliability and speed. Featuring a solid injection molded nylon resin frame and a single-action cam lock, these collars fit all standard 1-inch barbell sleeves with a lightweight 4-ounce design. Built to withstand intense workout environments and backed by a 3-year warranty, they ensure your weights stay secure so you can focus on crushing your fitness goals.

Specifications

ASIN	B00HFAJZK4
Best Sellers Rank	#19,043 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #17 in Exercise Collars
Brand Name	ironcompany
Customer Reviews	4.6 4.6 out of 5 stars (1,116)
Finish Type	Black
Global Trade Identification Number	00753182418711
Grip Size	1
Grip Type	Knurled
Item Dimensions L x W	2"L x 1.25"W
Item Weight	3.84 ounces
Manufacturer	Ironcompany.com
Material	Alloy Steel
Model Number	50478
Mounting Hole Diameter	1 inches
Number of Items	1
Part Number	50478
UPC	634392199549
Weight Capacity Maximum	4 ounces

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